Effect of controlled availability fertilizers on increasing fertilizer efficiency and decreasing labor costs.
肥效调节肥料（CAF）的节肥省工效应研究

It was observed by N isotopic technique that the application of CAF(controlled availability fertilizers) might increase nitrogen utilization efficiency and recovery rate which were two times as the traditional way .Furthermore ,the rate of nitrogen release coincided with the needs of crops to nitrogen .The split and popularization experiments also showed that the application of CAF significantly decreased the loss of nitrogen ,saved work hours and enhanced economic benefit.